Decontamination of Withania somnifera by Gamma Irradiation and its Effect on Antioxidant Activities
2015
Choi, Jong‐Il | Srinivasan, Periasamy | Park, Hyun
The current investigation was carried out to study the effect of gamma irradiations on decontamination of Withania somnifera and its antioxidant activity. W. somnifera dry roots were packed and irradiated at doses of 1–10 kGy following the storage at 4C within a week. At the dose of 10 kGy, the microbial contamination was lowered below detection level. Glycowithanolides are known for antioxidant components present in W. somnifera. The antioxidant activity of W. somnifera extract was investigated by measuring 1,1‐diphenyl‐2‐picrylhydrazyl, hydroxyl and superoxide radical‐scavenging activities. These activities were increased in samples extracted from the irradiated roots at 10 kGy. The extraction yield of the glycowithanolides was considered as one of the reasons for the increase of antioxidant activities of the extract. PRACTICAL APPLICATIONS: Withania somnifera is an important medicinal plant and has been widely used in India and other parts of the world as a home remedy for several diseases. Gamma irradiation has been used as a phytosanitary treatment of food and herbal materials. The present study was conducted to evaluate the effect of gamma irradiation on decontamination of W. somnifera and its effect on the antioxidant properties. These results suggest that gamma irradiation can be applied for phytosanitary of other herbal plants.
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